159 



MONOGRAPH OF THE GENUS 



STYLIFER, Broderip. 



Plate 479. 



Testa teniiissima, plerumque pellucida aut semipellucida, 

 polita, miiltispiralis giobosa vel subulata ; apice styliformi, 

 plerumque obliquo. — The Mollusca forming these little 

 glassy shells are parasitic, nesting in holes which they bore 

 in Star-fishes and Echini. One species, 8. Turtoni, is found 

 on a common British Echinus. 



Globose species. 



1. ASTEEicoLUS, f. 4, 5, Bvoderly. — Tenuissimus rotundus, 

 pellucidus, spira brevissima acuta ; apice styliformi ; ultimo 

 anfractu inflate ; apertura postice augusta, antice subquad- 

 rata ; labio extern© supra medium flexuosim producto. — No 

 other species has so large a body-whorl and so small a 

 spire. 



2. ovoiDEUs, f. 7, A. Adams. — 8. astericolo simillimus, 

 utrinque magis aouminatus, labio externo baud tantum inflexo. 

 The aperture is a little pointed, and the apex a little more 

 produced than in sp. 2. Also the outer lip is less inflected. 



3. Turtoni, f. 9, Broderip. — Quam 8. astericolus minor, 

 apice magis acuminate. — Like sp. 1, but smaller, and with a 

 more produced and pointed spire in proportion to the body 

 whorl. 



4. DUBIOS, f. 6, Balrd. — Quam 8. astericolus, &c., spira 

 magis producta, anfractu penultimo subelevato et inflate ; 



o o 



